deepcopy in embedding_attention_seq2seq-TypeError: can't pickle _cffi_backend.CTypeDescr objects

[leon-cas]

File "main.py", line 40, in
tf.app.run()
File "/home/luban/anaconda2/lib/python2.7/site-packages/tensorflow/python/platform/app.py", line 48, in run
_sys.exit(main(_sys.argv[:1] + flags_passthrough))
File "main.py", line 30, in main
train(args)
File "/nfs/private/proj/chatbot/lib/train.py", line 32, in train
model = seq2seq_model_utils.create_model(sess, args, forward_only=False)
File "/nfs/private/proj/chatbot/lib/seq2seq_model_utils.py", line 33, in create_model
forward_only=forward_only,
File "/nfs/private/proj/chatbot/lib/seq2seq_model.py", line 173, in init
softmax_loss_function=softmax_loss_function)
File "/nfs/private/proj/chatbot/lib/seq2seq.py", line 1142, in model_with_buckets
bucket_outputs, decoder_states, encoder_state = seq2seq(encoder_inputs[:bucket[0]], decoder_inputs[:bucket[1]])
File "/nfs/private/proj/chatbot/lib/seq2seq_model.py", line 172, in
lambda x, y: seq2seq_f(x, y, False),
File "/nfs/private/proj/chatbot/lib/seq2seq_model.py", line 136, in seq2seq_f
dtype=dtype)
File "/nfs/private/proj/chatbot/lib/seq2seq.py", line 798, in embedding_attention_seq2seq
encoder_cell = copy.deepcopy(cell)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 174, in deepcopy
y = copier(memo)
File "/home/luban/anaconda2/lib/python2.7/site-packages/tensorflow/python/layers/base.py", line 487, in deepcopy
setattr(result, k, copy.deepcopy(v, memo))
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 230, in _deepcopy_list
y.append(deepcopy(a, memo))
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 230, in _deepcopy_list
y.append(deepcopy(a, memo))
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 230, in _deepcopy_list
y.append(deepcopy(a, memo))
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 237, in _deepcopy_tuple
y.append(deepcopy(a, memo))
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 237, in _deepcopy_tuple
y.append(deepcopy(a, memo))
File "/home/luban/anaconda2/lib/python2.7/copy.py", line 182, in deepcopy
rv = reductor(2)
TypeError: can't pickle _cffi_backend.CTypeDescr objects

Anyone knows how to solve this problem? thanks